### Technical Overview of CW252016-R39G The **CW252016-R39G** is a high-frequency, wire-wound chip inductor commonly used in RF (Radio Frequency) circuits. It is part of the CW252016 series, where the numbers represent the physical dimensions of the component. --- ### 1. Key Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.39 µH (390 nH) | Measured at 25 MHz | | **Tolerance** | ±2% (G) | High precision for tuning | | **Case Size** | 2520 (Metric) / 1008 (Imperial) | 2.5mm x 2.0mm x 1.6mm | | **DC Resistance (DCR)** | 0.84 Ω (Max) | Resistance of the wire coil | | **Rated Current** | 350 mA (Max) | Maximum continuous current | | **SRF (Min)** | 500 MHz | Self-Resonant Frequency | | **Q Factor (Min)** | 45 | Quality factor at 25 MHz | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying similar components within the same family: * **CW**: Series prefix (Ceramic Wire-wound). * **252016**: Dimensions (L: 2.5mm x W: 2.0mm x H: 1.6mm). * **R39**: Inductance value (R represents the decimal point; R39 = 0.39 µH). * **G**: Tolerance code (G = ±2%). --- ### 3. Construction and Features 1. **Wire-Wound Structure:** Unlike multilayer inductors, this part uses a copper wire wound around a ceramic core. This provides significantly higher **Q factors** and lower DC resistance. 2. **Ceramic Core:** Provides excellent thermal stability and high SRF, making it ideal for high-frequency signal processing. 3. **Epoxy Coating:** Usually features a top-side epoxy or resin coating to provide a flat surface for automated Pick-and-Place (SMT) machines. --- ### 4. Common Applications * **RF Matching Networks:** Used in Bluetooth, Wi-Fi, and GPS modules to match impedance between components. * **Filters:** Integrated into Band-pass, Low-pass, and High-pass filters. * **Oscillators:** Provides stable inductance for frequency generation circuits. * **Telecommunications:** Used in mobile phones, base stations, and satellite equipment. ---